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Nanometer barium-strontium titanate medium energy storage material coated by aluminum-silicon composite oxide and preparation method thereof

A composite oxide, barium strontium titanate technology, applied in the field of electronic materials and devices, can solve the problems of lattice mismatch, poor particle uniformity, low dielectric constant of the sample, and achieve stable dielectric constant, lower reaction temperature, The effect of improving the breakdown electric field strength and temperature stability

Inactive Publication Date: 2012-07-04
TONGJI UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Currently, HY Tian[1] et al. directly prepared magnesium oxide-coated BST particles by chemical deposition of magnesium oxide precursors, while Jian Quan Qi[2] et al. have studied the process of coating BST materials with chemically deposited zinc oxide-doped magnesium oxide oxides, but their focus is on analyzing the lattice mismatch between the cladding layer and BST
Tong Wang et al. used AlCl3 solution to deposit and coat BST nanoparticles, but the uniformity of the coated particles was poor. Huber[4] and S.Mornet[5] et al. used the sol-gel method to coat BST particles with a silicon oxide layer, but the dielectric constant of the sintered sample was very low. density medium storage material

Method used

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  • Nanometer barium-strontium titanate medium energy storage material coated by aluminum-silicon composite oxide and preparation method thereof
  • Nanometer barium-strontium titanate medium energy storage material coated by aluminum-silicon composite oxide and preparation method thereof
  • Nanometer barium-strontium titanate medium energy storage material coated by aluminum-silicon composite oxide and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1～7

[0064] 1) Preparation of Ba 0.4 Sr 0.6 TiO 3 Powder, using the liquid phase alkoxide reaction method, choose Ba(OH) 2 ·8H 2 O, Ti(OBu) 4 (98%, provided by Sinopharm Chemical Reagent Co., Ltd.) and Sr(OH) 2 ·8H 2 O (99%, Alpha Company) is the main raw material, according to a certain Ba / Sr / Ti=4:6:10 molar ratio batching. First put a good amount of Ba(OH) 2 ·8H 2 O and Sr(OH) 2 ·8H 2 O was 30.901g, 25.770g was dissolved in 250ml deionized water at 80°C in a water bath to form solution A; then 66.693g of Ti(OBu) 4 Add it into 250ml ethanol solution, stir and dissolve it for 2 hours, and make solution B for later use.

[0065] 2) Slowly add solution B dropwise to solution A and vigorously stir for 2 hours, then filter the white precipitate. Dry the white precipitate at 100°C and then heat-treat it at 600°C, then ball mill it with zirconia balls and absolute ethanol for 20-24 hours, and then dry it to get Ba 0.4 Sr 0.6 TiO 3 Nano powder (~50nm) is used for later use....

Embodiment 1

[0072] Example 1 # -5 # The dielectric constant and loss versus temperature curves of the dielectric storage material made by the formula are as follows: figure 1 Shown; Example 1 # -5 # The relational curve of the breakdown electric field intensity and coating mass fraction of the medium storage material that formula is made is as figure 2 shown.

[0073] After testing, Example 6 # -7 # The relationship between dielectric constant and loss and temperature of the medium storage material made by formula is closer to example 1 # -5 # The formulation of the corresponding components, but its breakdown electric field strength and energy storage density decreased slightly.

[0074] Depend on figure 1 It can be seen from the dielectric thermogram that the Curie temperature and dielectric constant of this type of composite ceramic material can be effectively adjusted by controlling the ratio of the cladding layer in the composite material system, and a composite medium with ...

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Abstract

The invention provides barium-strontium titanate nanoparticles, which are coated with an aluminum-silicon composite oxide. The aluminum-silicon composite oxide contains Al2O3 and SiO2, and accounts for 1.0wt% to 10.0wt% the weight of barium-strontium titanate. The barium-strontium titanate nanoparticles have the following advantages: (1) the preparation temperature of the barium-strontium titanate nanoparticles is reduced to 80 DEG C, which is greatly lower than the preparation temperature (1100 DEG C) of barium-strontium titanate nanoparticles prepared by solid-phase synthesis; (2) ceramic materials with the particle size of 300nm to 500nm can be obtained to improve breakdown-resistant electric field intensity and dielectric performance; and (3) the medium energy storage ceramic material has stable dielectric constant under the action of an external high-voltage DC electric field, and so that the material is suitable for design and development of medium energy storage devices, such as capacitors.

Description

technical field [0001] The invention specifically relates to a strontium barium titanate nanometer material coated with an aluminum-silicon composite oxide and a preparation method thereof, belonging to the technical field of electronic materials and devices. Background technique [0002] With the development of modern high-tech fields such as electronic information, automatic control, aerospace, ocean ultrasound, communication technology, automobiles and energy, dielectric ceramics and high energy storage density ceramics play an increasingly important role in the development of information technology. effect. Therefore, the preparation technology of new functional dielectric energy storage ceramic materials and chip components has become a major research hotspot today. Among them, high energy storage density dielectric materials are highly valued by researchers and industries because of their wide application requirements in power systems and pulse power technologies. ...

Claims

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Application Information

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IPC IPC(8): C04B35/47C04B35/628
Inventor 翟继卫徐超沈波
Owner TONGJI UNIV
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